*{
    padding: 0;
    margin: 0;
}
.content{
    position: relative;
    display: flex;
    flex-direction: column;
}
img{
    z-index: 0;
    position: fixed;
}
.head{
    position: absolute;
    z-index: 1;
    width: 100%;
    height: 80px;
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
    background-color: rgba(0,0,0,0.4);
}
.head p{
    align-self: flex-end;
    font-size: 30px;
}
.head ul{
    margin-top: 45px;
    list-style: none;
    margin-right: 40px;
}
.head li{
    font-size: 25px;
    margin-right: 20px;
    display: inline;
}
a{
    text-decoration: none;
}
a:visited,a:link{
    color: azure;
}
a:hover,a:active{
    color: aqua;
}
.body{
    position: absolute;
    background-color: rgba(0,0,0,0.4);
    margin: 100px auto;
    left: 0;
    right: 0;
}
iframe{
    width: 100%;
    height: 100%;
    vertical-align: bottom;
}
